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<title>16.11.1 Template Objects </title>
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<h2><a name="SECTION00181110000000000000000"></a><a name="template-objects"></a>
<br>
16.11.1 Template Objects 
</h2>

<p>
Template objects following methods:

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3567' xml:id='l2h-3567' class="method">reset</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Restore a pipeline template to its initial state.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3568' xml:id='l2h-3568' class="method">clone</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Return a new, equivalent, pipeline template.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3569' xml:id='l2h-3569' class="method">debug</tt></b>(</nobr></td>
  <td><var>flag</var>)</td></tr></table></dt>
<dd>
If <var>flag</var> is true, turn debugging on. Otherwise, turn debugging
off. When debugging is on, commands to be executed are printed, and
the shell is given <code>set -x</code> command to be more verbose.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3570' xml:id='l2h-3570' class="method">append</tt></b>(</nobr></td>
  <td><var>cmd, kind</var>)</td></tr></table></dt>
<dd>
Append a new action at the end. The <var>cmd</var> variable must be a valid
bourne shell command. The <var>kind</var> variable consists of two letters.

<p>
The first letter can be either of <code>'-'</code> (which means the command
reads its standard input), <code>'f'</code> (which means the commands reads
a given file on the command line) or <code>'.'</code> (which means the commands
reads no input, and hence must be first.)

<p>
Similarly, the second letter can be either of <code>'-'</code> (which means 
the command writes to standard output), <code>'f'</code> (which means the 
command writes a file on the command line) or <code>'.'</code> (which means
the command does not write anything, and hence must be last.)
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3571' xml:id='l2h-3571' class="method">prepend</tt></b>(</nobr></td>
  <td><var>cmd, kind</var>)</td></tr></table></dt>
<dd>
Add a new action at the beginning. See <tt class="method">append()</tt> for explanations
of the arguments.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3572' xml:id='l2h-3572' class="method">open</tt></b>(</nobr></td>
  <td><var>file, mode</var>)</td></tr></table></dt>
<dd>
Return a file-like object, open to <var>file</var>, but read from or
written to by the pipeline.  Note that only one of <code>'r'</code>,
<code>'w'</code> may be given.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3573' xml:id='l2h-3573' class="method">copy</tt></b>(</nobr></td>
  <td><var>infile, outfile</var>)</td></tr></table></dt>
<dd>
Copy <var>infile</var> to <var>outfile</var> through the pipe.
</dl>

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